According to data released by the Illinois Gaming Board, November’s bets produced $41m in adjusted gross revenue for operators, down from the $42.2m generated in October.
November’s gains meanwhile generated $6m in state taxes.
The $451m total places Illinois fourth in the US legal sports betting market for November handle, with New Jersey leading the way with $931.6m. Nevada ($609.4m) and Pennsylvania ($491.9m) occupy second and third respectively.
Online sports betting accounted for the vast majority of all bets, given that retail sportsbooks were closed for the second half of the month.
Five online operators are currently active throughout Illinois, with Penn National's Barstool-branded app, BetMGM, and Unibet expected to launch in the state in the coming months.
“Illinois' success is more than just a large population fueling impressive numbers that dwarf smaller states,” said PlayIllinois.com analyst Jessica Welman.
“Illinois is rivaling markets such as Pennsylvania that are far more mature and just as large, and it's doing it because the top online sportsbooks in the country are investing heavily in the market and Illinois bettors are responding with an unprecedented fervor.”